name: Checkiday Holiday and Event API Vocabulary
description: >-
  Domain vocabulary for the Checkiday Holiday and Event API, covering the
  events catalog (single-day and multi-day holidays, observances, awareness
  campaigns), their descriptions and observance patterns, the apilayer
  delivery surface, and the rate-limit envelope returned with every response.
modified: '2026-05-30'
terms:
  - term: Event
    definition: A holiday, observance, awareness campaign, or other dated occurrence in the Checkiday catalog.
    related: [EventSummary, EventDetail, Occurrence]
  - term: EventSummary
    definition: The compact form of an Event returned in list and search responses; carries `id`, `name`, and `url`.
    related: [Event, GetEventsResponse, SearchResponse]
  - term: EventDetail
    definition: The full form of an Event with descriptions, founders, hashtags, images, sources, alternate names, observance patterns, and occurrences.
    related: [Event, GetEventInfoResponse]
  - term: Holiday
    definition: A widely recognized celebratory or commemorative Event (e.g. Cinco de Mayo, International Cat Day).
    related: [Event]
  - term: Observance
    definition: An Event with cultural, religious, or awareness significance that may not be a formal public holiday.
    related: [Event]
  - term: MultiDayEvent
    definition: An Event whose observance spans more than one day (e.g. Teacher Appreciation Week, Awareness Month).
    related: [Event, MultidayStarting, MultidayOngoing]
  - term: MultidayStarting
    definition: A list of multi-day Events that begin on the requested date.
    related: [GetEventsResponse, MultiDayEvent]
  - term: MultidayOngoing
    definition: A list of multi-day Events that are still being observed on the requested date but began earlier.
    related: [GetEventsResponse, MultiDayEvent]
  - term: AdultFlag
    definition: A boolean parameter controlling whether Events unsafe for children or the workplace are included in results.
    related: [GetEventsRequest, SearchRequest, EventDetail]
  - term: AlternateName
    definition: An additional name an Event is known by, optionally bounded by the years it was in effect.
    related: [EventDetail]
  - term: Founder
    definition: The person, organization, or campaign that originated an Event, with optional URL and founding date.
    related: [EventDetail]
  - term: Hashtag
    definition: A social-media tag associated with an Event, suitable for cross-platform publishing.
    related: [EventDetail]
  - term: Source
    definition: A citation URL that documents or attests to an Event.
    related: [EventDetail]
  - term: RichText
    definition: A text value provided in three encodings — plain text, HTML, and Markdown — for editorial flexibility.
    related: [EventDetail]
  - term: HowToObserve
    definition: A RichText description of how an Event is typically celebrated or observed.
    related: [RichText, EventDetail]
  - term: Pattern
    definition: A rule that defines when an Event is observed, with optional first/last year, a length in days, and an observed description.
    related: [Occurrence, EventDetail]
  - term: Occurrence
    definition: A concrete date instance of an Event observance, with a length in days.
    related: [Pattern, EventDetail]
  - term: Tag
    definition: A topical label attached to an Event for grouping (e.g. Food, Animals, Awareness).
    related: [Event]
  - term: ImageInfo
    definition: A set of small, medium, and large image URLs for an Event suitable for editorial and social-media use.
    related: [EventDetail]
  - term: IANA Timezone
    definition: A timezone identifier (e.g. `America/Chicago`, `America/New_York`) used to calculate the date boundary for /events.
    related: [GetEventsRequest]
  - term: RateLimit
    definition: The plan's monthly request quota and remaining requests, returned both as a JSON envelope and as HTTP headers.
    related: [GetEventsResponse, GetEventInfoResponse, SearchResponse]
  - term: ApiKey
    definition: The credential header (`apikey`) issued by apilayer that authenticates Checkiday API requests.
    related: [Authentication]
  - term: ApilayerMarketplace
    definition: The marketplace at apilayer.com that lists, packages, sells, and routes the Checkiday API.
    related: [BaseURL]
  - term: BaseURL
    definition: The canonical Checkiday API base URL `https://api.apilayer.com/checkiday`.
    related: [ApilayerMarketplace]
  - term: Plan
    definition: A subscription tier (Free, Basic, Pro, Enterprise, Custom) that determines monthly quota and price.
    related: [RateLimit, Pricing]
  - term: Pricing
    definition: The monthly cost in USD associated with a Plan.
    related: [Plan]